I have created automated email report using java mail api which needs to be triggered everyday after a batch file run.Although it works fine most of the times,at times it gives exception javax.mail.MessagingException: Could not connect to SMTP host: my host name, port: 25; nested exception is: java.net.ConnectException: Connection refused.This is not due to authentication issue as i use the same credentials whenever i sent the email.
I am not sure why java mail api fails intermittently.Can i get some suggestion to debug the issue?
I am using the below code snippet -
String to = "xyz#gmail.com";//change accordingly
String from = "abc#mydomain.com";//change accordingly
final String username = "abc";//change accordingly
final String password = "*****";//change accordingly
String host = "My SMTP server";
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", "25");
// Get the Session object.
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to));
message.setSubject("Testing Subject");
message.setText("message to stakeholders");
Transport.send(message);
}
It's a good idea to check logs on the mail server to see possible cause of the refusal - especially since you know WHEN failed attempts were made at.
If JavaMail can't connect "sometimes" with "connection refused", the possibilities are:
The server is actually down.
The server is up, but too busy to accept new connections.
The server is up, but is rejecting connections for some policy reason, e.g., you've connected too frequently.
Some firewall or anti-virus program has rejected the connection.
Check the server configuration and log files. If there's nothing on the server indicating that it's rejecting connections, check the client.
Related
I do have a java web application that is used for storing data about issues we faces daily.
There are many users and each user will be inserting data into it daily and by the end of day we'll gather that particular days data and then mail it to everyone.
We are using the web app to do this. But as of now web app generates consolidated data for one day when I trigger it using a button press.
And the code written to create excel sheet drafts a excel sheet and this one i mail to everyone. This web application is being run on a server.
I wish to automate this process i.e. each night at some specified time it should automatically trigger the function and generate the excel sheet and it should mail it to everyone.
I don't have much idea about how to go forward so I thought first I'll write java code to send mail and later think about triggering the function at a particular time.
I would like to know whether is there any other better way to deal with my requirement. I'am open to suggestions.
Also, the code I have written to send the mail is not working. It is giving me exception and I tried almost everything I could find but nothing is working. Could someone help me in sorting out the error.
Here's the code :
package com.email;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendEmail {
public static void main(String[] args) {
// Recipient's email ID needs to be mentioned.
String to = "toemail#gmail.com";
// Sender's email ID needs to be mentioned
String from = "fromemail#gmail.com";
final String username = "username";//change accordingly
final String password = "password";//change accordingly
String host = "smtp.gmail.com";
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", "587");
// Get the Session object.
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
try {
// Create a default MimeMessage object.
Message message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress(from));
// Set To: header field of the header.
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to));
// Set Subject: header field
message.setSubject("Testing Subject");
// Now set the actual message
message.setText("Hello, this is sample for to check send " +
"email using JavaMailAPI ");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}
Exception that I am receiving is :
Exception in thread "main" java.lang.RuntimeException: com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 587; timeout -1;
nested exception is:
java.net.UnknownHostException: smtp.gmail.com
at com.tutorialspoint.SendEmail.main(SendEmail.java:62)
Caused by: com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
nested exception is:
java.net.UnknownHostException: smtp.gmail.com
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2209)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740)
at javax.mail.Service.connect(Service.java:388)
at javax.mail.Service.connect(Service.java:246)
at javax.mail.Service.connect(Service.java:195)
at javax.mail.Transport.send0(Transport.java:254)
at javax.mail.Transport.send(Transport.java:124)
at com.email.SendEmail.main(SendEmail.java:57)
Caused by: java.net.UnknownHostException: smtp.gmail.com
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:353)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:239)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2175)
... 7 more
According to the logs you cannot reach the gmail smtp. Are you maybe behind a proxy/firewall? Did you try pinging the smtp?
For running the tasks automatically you just need to add a scheduling framework to run the code at a certain time.
You could use quartz for example
A friend of mine has a new website and i build him a tool to organize email-addresses and send newsletters (HTML-Messages). Therefore i use the javax.mail library. While developing i sent all mails from my gmail account and it worked fine. But now, for "production", i want to send the mails from his domain, which is hosted by 1und1.
I am able to connect successfully to the 1und1 smtp-Server, but as soon as i send a mail, i get the following errors:
com.sun.mail.smtp.SMTPSenderFailedException: 550-Requested action not taken: mailbox unavailable
550 invalid DNS MX or A/AAAA resource record
When sending from the online 1und1 webmailer, i can send to any mailadress without errors.
These are the props i set for mailing. Like i said, i can connect to the server with these information, but sending fails.
Properties props = new Properties();
// Zum Senden
props.setProperty("mail.smtp.starttls.enable" , "true");
props.setProperty("mail.smtp.host", configurationService.getMailHost()); // smtp.1und1.de
props.setProperty("mail.smtp.auth", configurationService.getMailAuth().toString()); // true
props.setProperty("mail.smtp.port", configurationService.getMailPort()); // 587
props.setProperty("mail.smtp.user", user);
props.setProperty("mail.smtp.password", pass);
return Session.getInstance(props, new javax.mail.Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(props.getProperty("mail.smtp.user"),
props.getProperty("mail.smtp.password"));
}
});
Thanks for help!
Edit: When Debugging the Session, i get the following line just before the exception occurs:
MAIL FROM: <USER#LAPTOP-Name.fritz.box>
How can i change this to something accepted?
This is my code...
final String from = "demo#ourmail.com";
final String password = "demo1234";
Properties props = new Properties();
props.put("mail.smtp.host", "14.141.48.131");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(from, password);
}
});
try {
String subject = "Registeration conformation for happy shopping";
String to = demo#gmail.com;
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to));
message.setSubject(subject);
message.setContent("<html>\n"
+ "<body>\n"
+ "\n"
+ "<p> you are successsfully login</p>"
+ "</body>\n"
+ "</html>", "text/html");
Transport.send(message);
System.out.println("end of utility");
} catch (Exception ex) {
System.out.println(ex);
}
After running this, an exception is generated, i.e.
javax.mail.MessagingException: Could not connect to SMTP host: 14.141.48.131, port: 25;
nested exception is:
java.net.SocketException: Permission denied: connect
Please suggest how I can handle this exception.
Your Java code looks fine. Successfully communicating with your mail server is the hard part.
Maybe you're running Java 7, and maybe (per this link) the problem can be resolved by setting this simple JVM parameter: -Djava.net.preferIPv4Stack=true.
Definitely check your firewall (make sure the SMTP port is open between your Java program and the mail server), and definitely check for any anti-virus programs that might be restricting SMTP on the mail server.
Or maybe your mail server requires SSL/TLS encrypted SMTP port 465 (instead of SMTP port 25).
Then again, maybe your ISP/internet provider doesn't permit SMTP at all.
There are a million possibilities. Talk with your network administrator. And try these SMTP troubleshooting tips (independent of debugging your Java program):
http://www.port25.com/how-to-check-an-smtp-connection-with-a-manual-telnet-session-2/
PS:
Never ever EVER!!!! post real usernames, passwords ... or IP addresses. In ANY external forum.
One of my customers is using Gmail for business (part of Google Apps) and I had to reconfigure the website I've developed so it would match the new credentials. After a bit of struggle due to TLS errors, I've managed to make the code work on localhost and on my test server (both Apache Tomcat 5.5). Everything was going smooth until I had to move it on his server (another Tomcat 5.5 as the hosting company told me). On the client's server I get the following error:
javax.mail.SendFailedException: Sending failed;
nested exception is:
class javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465;
nested exception is:
java.io.IOException: Couldn't connect using "javax.net.ssl.SSLSocketFactory" socket factory to host, port: smtp.gmail.com, 465; Exception: java.lang.reflect.InvocationTargetException
The strange thing is that on localhost and the test server the port 465 works fine, and the guys from hosting said that port is opened on their server.
The code that connects to the mailserver is:
private void initConfigParams() throws CMSGeneralException {
try {
props = System.getProperties();
String smtpHost = Messages.getDBConfString("mail.smtp.host");
String mailPort = Messages.getDBConfString("mail.smtp.port");
String socketFallback = Messages.getDBConfString("mail.smtp.socketFactory.fallback");
String enableTls = Messages.getDBConfString("mail.smtp.starttls.enable");
String authSmtp = Messages.getDBConfString("mail.smtp.auth");
String tlsRequired = Messages.getDBConfString("mail.smtp.stattls.required");
String sktFactory = Messages.getDBConfString("mail.smtp.socketFactory.class");
props.put("mail.smtp.starttls.enable", enableTls);
props.put("mail.smtp.host", smtpHost);
props.put("mail.smtp.auth", authSmtp);
props.put("mail.smtp.starttls.required", tlsRequired);
props.setProperty("mail.smtp.socketFactory.class", sktFactory);
props.setProperty("mail.smtp.socketFactory.fallback", socketFallback);
props.setProperty("mail.smtp.port", mailPort);
props.setProperty("mail.smtp.socketFactory.port", mailPort);
props.put("mail.transport.protocol", Messages.getDBConfString("mail.transport.protocol"));
Authenticator auth = null;
userName = Messages.getDBConfString("mail.username");
userPassword = Messages.getDBConfString("mail.userpassword");
if (!CMSUtils.isEmptyString(userName) && !CMSUtils.isEmptyString(userPassword)){
/* props.put("mail.smtp.auth", "true"); */
auth = new SMTPAuthenticator(userName, userPassword);
}
session = Session.getDefaultInstance(props, auth);
session.setDebug(false);
address = new InternetAddress[1];
address[0] = new InternetAddress(recipients);
mbText = new MimeBodyPart();
mbText.setContent(text, "text/html");
mp = new MimeMultipart();
mp.addBodyPart(mbText);
} catch (MessagingException e) {
e.printStackTrace();
throw new CMSGeneralException();
}
}
With the following .properties file
mail.smtp.starttls.enable=true
mail.smtp.host=smtp.gmail.com
mail.smtp.auth=true
mail.smtp.starttls.required=true
mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
mail.smtp.socketFactory.fallback=false
mail.smtp.port=465
mail.transport.protocol=smtps
mail.username=website#example.com
mail.userpassword=password
mail.from=website#example.com
mail.to=mail#example.com
I tried the other ports for GMail, 587, but it doesn't work on any of the servers. Not even port 25 won't do the trick.
So, what am I doing wrong, and what should I do to make the mailing work?
Get rid of all the socket factory properties; if you're using a reasonably recent version of JavaMail you don't need them. See the JavaMail FAQ for how to configure JavaMail to access Gmail. You'll also find debugging tips there if it still doesn't work.
Also, change Session.getDefaultInstance to Session.getInstance.
And finally, if you're setting "mail.transport.protocol" to "smtps", you need to set the other properties as "mail.smtps." properties, not "mail.smtp." properties.
It seems to you have problems with java.lang.reflect.InvocationTargetException. So, I mean it's not a network problem. May be you've specified some parameters wrong and JavaMail API routes couldn't invoke a method. May be you should also specify property mail.smtp.ssl.socketFactory.
Some documentation here http://javamail.kenai.com/nonav/javadocs/com/sun/mail/smtp/package-summary.html .
I have been working at home on Gmail-Imap-Api on the weekend. It was working Properly But when i returned to office and am trying here it throws exception.
Properties props = System.getProperties();
props.put("mail.store.protocol", "imaps");
props.put("mail.smtp.auth", "true");
try {
boolean debug = false;
Authenticator auth = new SMTPAuthenticator(
"***", "***");
Session session = Session.getInstance(props, auth);
session.setDebug(debug);
Store store = session.getStore("imaps");
store.connect("imap.gmail.com", "***#gmail.com",
"****");
......
......
This was working fine at home netwrok.
Now i thought i would add proxy and added these lines of code.
System.setProperty("http.proxyHost", "****.com");
System.setProperty("http.proxyPort", "8080");
Still it doesnt work and the exception is.
com.google.code.javax.mail.MessagingException: imap.gmail.com;
nested exception is:
java.net.UnknownHostException: imap.gmail.com
at com.google.code.com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:665)
at com.google.code.javax.mail.Service.connect(Service.java:295)
at com.google.code.javax.mail.Service.connect(Service.java:176)
at openReports.OpenReportsProject.main(OpenReportsProject.java:43)
Caused by: java.net.UnknownHostException: imap.gmail.com
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:367)
at java.net.Socket.connect(Socket.java:524)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:545)
at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)
at com.google.code.com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
at com.google.code.com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
at com.google.code.com.sun.mail.iap.Protocol.<init>(Protocol.java:113)
at com.google.code.com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:110)
at com.google.code.com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:632)
... 3 more
The proxy settings that you have entered will work only for HTTP connections. IMAP is a different protocol operating on a different port (993 in this case). If you are behind firewall, your firewall needs to allow connection to the external host:port AND the protocol. You need to request to your Network Administrator for this. Once the settings are in place you will be able to communicate to Gmail Imap server on default/specified port with specified protocol.